Drill steel sharpening mechanism



July 4, 1933. w. H. WINEMAN 1,916,904

DRILL STEEL SHARPENING MECHANISM Filed Nov. 20, 1929 2 SheetsSheet 1 Fig 4. J 54' [HOP/2 Z01 Wade H lVZ/Y 6/220)? July 4, 1933. w H, WINEMAN 1,916,904

DRILL STEEL SHARPENING MECHANISM Filed Nov. 20, 1929 2 SheetsSheet 2 Patented July 4, 1933 a'rn'r w "WADE VVINEIJLAN, OF MICHIGAN CITY, INDIANA, ASSIGNOR TO SULLIVAN IiZACHINEEY COM'PAHY, A. CORPORATION OF MASSACHUSETTS DRILL STEEL SHAEEENING TiEECH.ANIS1"/T Application filed November 20, 1929.

lliy invention relates to mechanism for sharpening drill steels; and more particular- 1y relates to clamping mechanism for holding a tool during a forging operation.

5) One object of my invention isto provide an improver drill steel sharpening mechanism. A further object of my invention is to provide improved mechanism for clamp ing a work piece during a forging opera w tion. [1 ore specific object of my invention is to provide clampingmechanism for hold ing work piece during a forging operation, in which pressure fluid is employed for actuating the clamping mechanism, and 111 35 which but a minimum amount of pressure fiuid is required. Further and more specific objects of invention will become apparent during the ensuing description, and will he further pointed out in the accompanying in v in the accompanying drawings in which l' have shown one illustrative embodiment of mv invention: 2

I 1 is a side view partly in elevation drill steel sharpening mechanism in h my improved clamping mechanism has been incorpora ed, part of the view bei 11g sec tional to more clearly illustrate details of the echanism.

30 Ni is a detail view partly in side elevation showing the clamping mechanism in position releasing the work piece, part of the view sectional as in Fig. Fig. is a transverse vertical section on 35 line 3-3 of F 1.

1 1 n ,e ional View of the valve for controlling the clamping mechanism; and is taken on line 4i;- i of Fig. 5 is a vertical sect onal view through EC vhve mechanism ta n on line 5 5 of LL. The drill sharpening mechanism may, as i histrated. include frame 8 upon which is mounted a swaging mechanism 9 which ini A s a s nhides inner 10 and mechanism 11 for the hammer. Pressure fluid for a euating the mechanism 11 is supplied thes ,ongh a pipe connection 12. A dolly hammer mechanism 13 is also supported on the base 8, air being supplied there- Serial No. 408,618.

to through a pipe 1 1. The dolly itself is indicated by the numeral 15, being removably held in place by the pivoted clamping member 16 which is engaged by a bolt 17 7 around whose lower end is coiled a spring 18. The bolt 17 is carried by a projecting lug 19 on a transverse member 20 of the clamping mechanism 21, which is adapted to clamp a work piece during forging of the end there of by the dolly hammer mechanism 13. A horizontal portion 22 of the frame 8 constitntes the second transverse member of the clamping mechanism 21 A pair of clamping dies 23 and are secured respectively to the transverse members 20 and 22. A pair 6 of clamping rods 25 are screwed into the transverse member 20, their lower ends being fastened to a transverse member 26 by nuts 27. A slidcway 28 is provided by the base Y 8 for guiding the transverse member 26.

The rear portion of the frame 8 carries a plate 29 which clamps a diaphragm 30 in place in an opening in the frame by means of bolts 31. A reciprocable member 32 acts as an abutment for the diaphragm, the member 32 being connected to the transverse member 26 by a linkage 33. This linkage comprises a substantially vertical link 3 1 constituting in effect a guiding member and pivoted at to the base 8 and pivoted at its upper end. to the member 32 by a pin 36. The same pin carries a bell crank lever 38 having a short arm 39 and a longer arm 40. The short arm 39 forms one arm of a toggle link mechanism, the other arm 41 being pivoted thereto at 42. The other end of the toggle link 41 is pivoted to the transverse member 26 at 43. The end of the arm of the bell crank lever 38 is pivoted to a piston rod 44, whose end carries a piston 45, reciprocable in a cylinder member 16. The cylinder member 46 is pivoted at 47 to the frame 8. The link 84 limits the movement of the member to an arcuate path which is of small angular extent, the movement of the member 32 being substantially horizontal. Both its movement, and a tangent to its arc of movement, are therefore at substantially right angles to the direction of movement of member 26. l Vhen the links 41, 39 are I the member 32 against the hook-s 68 as soon as the toggle is broken. In order alined they make, preferably, an acute angle of more than 45 with the direction of movement of member 32, whereby clamping power is increased. Accordingly, the arrangement of the link 34 and of the links 41, 39 constitutes a mechanism having a mechanical advantage greater than unity. The actual pressure downwardly upon the member 26 is greater than the horizontally acting pressure on'the member 22.

Air is supplied to the upper end of the cylinder member 46 through a passage 48 which is connected to a hose 49 leading to the valve mechanism 50 mounted on the plate 29. Air is supplied to the lower end of the cylinder member 46 through a port 51 which is connected to a hose 52, which also leads to the valve mechanism 50. The valve mecha nism 50 controls the supply of air to the diaphragm 30, the two ends of the cylinder member 46, and to the dolly hammer mechanism 13. Air or other fluid under pressure for actuating the various elements of the forging mechanism is supplied through a pipe 53, shown in Fig. 4 as entering the rear portion of the valve mechanism 50. The

pipe 12 is always in free communication with a chamber 54 of the valve mechanism, which is in communication with the supply pipe 53. A rotatable valve element 55 is provided with a pair of flat wings 56, 57 which cover ports 58 and 59 communicating with a chamber 60 in the cover plate of the valve mechanism.

The pipe .14 is in free communication with the chamber 60; and, therefore, when the ports 58.and 59 are uncovered by the wings 56 and 57, air is supplied to the dolly mechanism. The third wing 61 of the valve element 55 is formed to provide a chamber or recess 62. A plurality of ports cooperate with this chamber 62, one of which is an exhaust port 63 (see Fig. 5). A second port 64 leads to the diaphragm 30; a third port 65 leads to the upper end of the cylinder member 46, delivering pressure fluid thereto through hose 49; and a port 66, which is shown in Fig. 5 as being outside the chamber 62, that is to say, uncovered by the wing 61, leads to the lower end of the cylinder member 46 delivering pressure fluid thereto through hose 52. The cylinder and piston 46, 45 are not relied upon for the final clamping of the steel, but are primarily intended to straighten out the toggle links 39 and 41.

\Vhen the piston 45 is moved to the upper end of the cylinder, there is a tendency to pull the member 32 away from the diaphragm 30. The inner ends of the plurality of upper bolts 31 are formed as hook-shaped members 68 to engage the top portion of the member 32. A spring 69 is interposed between the lower end of the member 32 and the link 34 so as to resiliently press the upper end of aped ends to prevent the toggle links going past dead center, a lug 70 is formed on the link 41 for engaging a web 71 stretched between the arms 39 and 40 of the bell crank lever 38. A lever 72 is secured to the spindle 7 3 of the valve element 55. A rod 7 4 having a handle is connected to the lever 72 by a pin and slot connection 76. As the rod 74 is reciprocated the valve element 55 is rotated.

The operation of my improved mechanism will now be clearly apparent. lVith the clamping dies separated as shown in Fig. 2, the valve will be in the position shown in Fig. 5: and in this position, air is supplied through the pipe to the chamber 54 which is in :"ree communication with the port 66, air being supplied therethrough to the lower end of the cylinder 46 so as to hold the arm 40 in elevated position. As soon as the valve is moved by the lever 7 2, the port- 66 is covered by the wing portion 61 of the valve element and as soon as the port 65 is in communication with the chamber 54, the port 66 is placed in communication with the exhaust port 63. Air is now supplied to the passage 48, and air is vented through the hose 52, the port 66, and the exhaust port 63. The toggle links 39, 41 are now straightened, and prepared for the next movement of the valve element 55. This movement uncovers the port 64 so that air is now supplied to the diaphragm 30. This presses the member 32 outwardly; but since the pin 36 is connected by the link 34 to the base 8, the pin 36 must swing about the pin 35 as a center; and this forces the toggle links 39 and 40 downwardly, bringing the full power of the large diaphragm 30 to bear upon the vertical links 25, 25. The drill steel or other work piece is now clamped in position. The ensuing movement of the valve element 55 uncovers the ports 58, 59 so as to supply air to the dolly hammer mechanism 13.

Reverse movement of the rod 74 will first cut off the supply of air to the dolly hammer mechanism 13. The next part of this reverse movement will cut off the supply of air to the port 64, and place the latter in communication with the exhaust port 63. The final part of the reverse movement of the valve element 55 will place port 65 in communication with the exhaust port 63, and place the port 66 in communication with the chamber 54. This causes the piston 45 to be moved upwardly, breaking the toggle, and moving the upper clamping die 23 away from the lower clamping die 24.

If desired, a well known type of interlockin mechanism may be employed between the rod 74 and the controlling means for the vertical swaging hammer mechanism 11. Such interlocking mechanism is well known in the art; and is designed to prevent actuation of the vertical hammer while the dolly mechanism is in operation.

It will be obvious that my improved clamping mechanism isvery economical of pres sure fluid, since but asmall cylinder member 46 is employed for moving the clamping die 23 through the greater portion of its travel. The diaphragm 30' has a large area; but only a small amount of pressure fluid is used in connection therewith since the member 52 need move but slightly, in order to finally clamp the work piece. A very powerful clamping mechanism is provided, however, which securely holds the work piece during forging. It is obvious, therefore, that I have provided an efiicient mechanism for clamping the work piece during forging by means of a dolly hammer mechanism, or other forging apparatus.

lVhile I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

That I claim as new and desire to secure by Letters Patent is:

1. In a forging machine, means for clamping a work piece including a reciprocable clamp actuating member and means for reciproeating said clamp actuating member comprising a motor having a movable force transmitting element, the path of movement of said reciprocahle clamp actuating member bein angularly related to the path of movement of said element, link means connecting said element and clamp actuating member nd pivoted to each of the same, and a tie member oscillatable about a relatively fixed pivot disposed at the same side of the path of movement of said element as the pivotal connection of said link means wi -l1 said clamp actuating member, said tie member being pivotally connected directly to said element and placed under tension during clamping, and maintaining a portion of said element at a substantially uniform distance from the fixed pivot.

2. In a forging machine, means for clamping a work piece including a clamp member reciprocable in a rectilinear path, a pair of clamp jaws one of which is secured to said clamp member for rectilinear movement therewith, and means for reciprocating said clamp member comprising a fluid actuated motor for producing a juxtaposed position of said jaws, and a fluid actuated motor for thereafter producing final clamping action of said clamping jaws, and exclusively mechanical connections between each of said motors and said clamp member including toggle links brought into alinement by movement of said first mentioned motor and means cooperating with said toggle links to provide force transmitting connections having a mechanical advantage greater than unity for transmitting the power of said second mentioned motor to said reciprocable clamp memher.

3. In a forging machine, means for clamping a work piece including a movable clamping aw and means for actuating said aw comprising a motor having a movable force transmitting member, a member movable with said clamping jaw, mechanism arranged betwecn said members and positionable to operatively connect said motor to said jaw to actuate the same, or releasable to break said connection, the directions of movement of said members being angularly disposed with respect to each other, guiding means preventing movement of said force transmitting member out 01 a predetermined path, and means for positioning said mechanism between said members to operatively connect said jaw and motor.

4c. In a forging machine, means for clamping a work piece including a movable clamping jaw and means for actuating said jaw comprising a motor having a force traismitting member movable substantially horixentriliv, a member movable substantially vertically for moving said movable c amping jaw, mechanism arranged between said members and positionable to operatively connect said motor to said vertically movable member, or releasable to break d eonnec tion, guiding means preventing movement of said force transmitting member out of a predetermined substantially horizontal path, and power actuated means for positioning said mechanism between said members to operatively connect said vertically movable member with said motor.

5. In a forging machine, in combinaticn with a movable clamping jaw, means for actuating the movable jaw comprising a motor having a. movable force transmitting member, a member movable in a direction at an angle with respect to the direction 01" motion of said force transmitting member for moving the movable aw, toggle linkage connecting said members, means for making and breaking said toggle linkage, and guiding means preventing movement of said movable force transmitting member out of a predetermined path.

6. In a forging machine, in combination with a movable clamping jaw, means for actuating the movable jaw comprising a motor having a movable force transmitting member, a member movable in a. direction at an angle with respect to the direction of reciprocation of said force transmitting mem her for moving the movable aw, toggle linkage connecting said members, means for making and breaking said toggle linkage, and means pivoted on an axis lined relative to said motor and operatively connected to said force transmitting member for guiding the latter.

7. In a forging machine, means for clamping a work piece including a movable clamping jaw and means for actuating said jaw comprising a pressure fluid actuated motor havin a movable force transmitting member, a member movable with said clamping jaw,

mechanism arranged between said members said members.

8. In a forging machine, means for clamping a work piece including relatively movable clamping jaws and means for producing relative movement therebetween comprising an expansible chamber motor having a movable force transmitting member, a member mow able in a direction at an angle with respect to the direction of motion of said movable force transmitting member for producing relative movement between said clamping jaws, toggle linkage connecting said members, means including an expansible chamber type motor for making and breaking said toggle linkage, and guiding means preventing movement of said movable force transmitting member out of a predetermined path.

9. In a forging machine, means for clamping a work piece including a clamp member reciprocable in a rectilinear path, a pair of clamping jaws one of which is movable with said clamp member, a main motor of rela tively high power for producing final clamping action of said clamping jaws, a supplemental motor of relatively lower power for effecting a juxtaposed positioning of sa d jaws. and mechanism cooperating with said supplemental motor and clamp member and movable by the former for producing juxtaposed positioning of said jaws wheirmoved into one position and separation of said aws when moved into another position, said mechanism comprising pivotally connected links and when in the first mentioned position cooperating with said main motor and clamp member for producing final clamping action oi said clamping jaws, said links in such first mentioned position being substantially alined and extending in a direction 'niaking an acute angle of more than 45 with the direction of movement of the power transmitting element of the main motor.

10. In a forging machine, means for clamping a work piece including a clamp member reciprocable in a rectilinear path, a pair of clamping jaws one of which is movable with said clamp member, a main motor of relatively high power for producing final clamping action of said clamping jaws, a supplemental motor of relatively lower power for effecting a juxtaposed positioning of said jaws, and mechanism cooperating with said supplemental motor and clamp member and movable by the former for producing juxtaposed positioning of said jaws when moved into one posit-ion and separation of said jaws when moved into another position, said mechanism comprising pivotally connected links and when in the first mentioned position cooperating with said main motor and clamp member for producing final clamping action of said clamping aws, said links in such first mentioned position being substantially alined and extending in a direction making an acute angle of more than l5 with the direction of movement of the power transmitting element of the main motor, and said motors both being of the pressure fluid actuated type.

11. In a forging machine, means for clamping a work piece including relatively movable clamping jaws and means for producing relative movement therebetween comprising a i'eciprocable clamp member, a motor, a pivoted member actuated by said motor, mechanism adapted to be arranged between said members to opei'atively connect said motor to said clamp member to reciprocate the same, or to be released to break said connection, the arc of movement of said pivoted memher having a tangent to which the direction of reciprocation of said reciprocable clamp member is substantially perpendicular, and means for arranging said mechanism between said members to operatively connect said motor to said clamp member.

12. In a forging machine, means for clamping a work piece including a reciprocable clamp member and means for reciprocating said clamp member comprising a motor having a movable force transmitting element, the path of movement of said reciprocable clamp member being angularly related to the path of movement of said element, a frame supporting said motor, toggle mechanism connecting said element and clamp member and including links pivoted one to each of the same, and a member oscillatable about la relatively fixed point on said frame and pivotally connected directly to said element for transmitting reaction to said frame and guidin g said movable force transmitting element.

In testimony whereof I aflix my signature.

WADE H. IVINEMAN 

